Before I continue, thanks to review on this.
I have imported a full romset for mame. At the initial import, most of the games were not added with the images because of my low internet connection. After this initial import, I have tryied again and in this second try, 90% of the games were added with the media files. (images, videos, etc).
My problem is:
When I try to change all games (+3,000) to the group image to "3D boxes" launchbox change it only for some images instead of all:
but the images that are not showing the "3D boxes" exists:
How can I change the image style for all 3,000 games instead one by one?